IP Subnet Calculator
Developer ToolsNetwork, broadcast and host range from CIDR
Similar tools you may like
History
All history →IP Subnet Calculator — at a glance
Enter an IPv4 address and CIDR prefix to get the network address, broadcast address, subnet mask, wildcard mask, first and last usable host and the number of hosts.
How to use it — step by step
An IPv4 address and a prefix length.
Enter your values
Fill in the boxes. Sample values are already there so you can see how it works.
Calculate
Press the button to get your answer instantly.
Read the result
The main answer is shown in a large card with extra details below it.
Copy it
Use the copy button to save the result anywhere.
Pro tips
Small things that make the result better.
Quick facts
Frequently Asked Questions
What is CIDR?+
A short way to write the subnet mask. /24 means the first 24 bits are the network part.
Is my data safe?+
Yes. Everything runs inside your own browser. Your text, files and images are never uploaded to any server.
Is this tool really free?+
Yes — completely free, no signup, no watermark and no usage limit.